Four men have pleaded guilty to being part of an Easter weekend Eftpos card "skimming" scam.

William Rivera Rivas, Mario Rivera, Sina Chea and Kevin Roberto Flores-Roldan pleaded guilty in the Auckland District Court this morning to charges of using a document to gain a pecuniary advantage and participation in an organised criminal group.

Police have said all four are from Canada though their charge sheets list only one, 27-year-old Flores-Rodan, as being Canadian.

Rivera-Rivas, 27, was listed as a factory hand born in El Salvador, as was Rivera, 31.

Chea, 40, was listed as a cook from Cambodia.

The "documents" listed on the charge sheets were 10 PIN entry devices, made by the company VeriFone, valued at $621 each.

The charges relate to a bank scam in which dozens lost thousands of dollars over the Easter weekend from withdrawals made via a Canadian ATM machine. The scam hit customers at BNZ, Westpac and ASB.